CODEWITHSUNDEEP
c#events
alaslipknot
alaslipknot

Reputation: 561

Is there a way to catch a method call without subscribing it to any sort of Events?

suppose we have this scenario :

a class that you are not allowed to modify anything in it : 

 public class ForbiddenClass_A
    {

        public void TheMethod()
        {
            //do stuff
        }
    }

and another read only class that calls a method from the previous class:

public class ForbiddenClass_B
{
    ForbiddenClass_A fc_a;

    void Update()
    {
        //some logic that if true it will call :
        fc_a.TheMethod();
    }
}

Now you have your class, that you do anything to it, and from it you want to know if TheMethod() :

public class MyClass
{
    //call this when TheMethod() from ForbiddenClass_A is called.
    public void TheMethod_Catcher()
    {

    }
}

Thank you!

Upvotes: 0

Views: 44

Answers (1)

TheGeneral
TheGeneral

Reputation: 81493

Is there a way to catch a method call without subscribing it to any sort of Events?

Decoupled messaging is probably where you want to be, event aggregator or any other pub sub method messaging system. Although you still have to subscribe to something, the participants need not know about each other allowing you to make the methods private.

Unity, MvvmLight both have these sorts of messaging systems, however they are truly dime-a-dozen, there are plenty

Example of how this might work 

public CreateUserForm()
{
    InitializeComponent();
    EventPublisher.Instance.Subscribe<NewUserCreated>
        (n => listBoxUsers.Items.Add(n.User.Name));
}

...

// some other class
private void Update()
{

    var user = new User()
               {
                   Name = textBoxUserName.Text,
                   Password = textBoxPassword.Text,
                   Email = textBoxEmail.Text
               };
    EventPublisher.Instance.Publish(new NewUserRequested(user));
}

Update

There are injection techniques if you are interest for .net

Dynamically replace the contents of a C# method?

Upvotes: 2

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